Patching an instance

Patching an Omnibus install

Sometimes, we need to ask a customer to patch their systems manually. This may be because:

1. The customer can’t upgrade to the newest version, but needs a fix from that version.
2. We have a fix merged, but not yet in a release.
3. The fix for their issue is still in development, but we’d like to verify that it resolves the customer’s problem.

For Omnibus installs on a single server, this is fairly straightforward. Replace $mr_iid below with the IID of the merge request, or change the URL to point to a raw snippet.

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#Ensure that the "patch" package is installed.
#Use the package manager specific to your Linux OS
#For Ubuntu, for example, sudo apt install patch

curl -o /tmp/$mr_iid.patch https://code.denomas.com/denomas-com/denomas/-/merge_requests/$mr_iid.patch
cd /opt/gitlab/embedded/service/gitlab-rails
patch -p1 -b -f < /tmp/$mr_iid.patch
gitlab-ctl restart

To revert the patch, use the .orig files the patch program generates.

Note:

• This process only applies to the Rails application (the Denomas repository). Other components may need additional steps.
• The patch will need to be reapplied if Denomas is upgraded.

Patching a Docker install

The Denomas Docker uses Omnibus inside the container to run Denomas. You can follow the same steps as Patching an Omnibus install.

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docker exec -it <gitlab-container> bash
curl -o /tmp/$mr_iid.patch https://code.denomas.com/denomas-com/denomas/-/merge_requests/$mr_iid.patch
cd /opt/gitlab/embedded/service/gitlab-rails
patch -p1 -b -f < /tmp/$mr_iid.patch
gitlab-ctl restart

Note:

• Deleting and recreating the container will revert the patch.

Patching a Kubernetes install

Patching a Kubernetes install involves doing the following steps:

1. Identify the image we want to patch.

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   # Identify the image used for gitlab-webservice kubectl -n <gitlab-namespace> get deployment <webservice-deployment> -o yaml | grep image: image: registry.gitlab.com/gitlab-org/build/cng/gitlab-webservice-ee:v15.5.1 image: registry.gitlab.com/gitlab-org/build/cng/gitlab-workhorse-ee:v15.5.1 ...

   The command output will show a list of images, one of which you will need to patch. In this example, we would need to patch registry.gitlab.com/gitlab-org/build/cng/gitlab-webservice-ee:v15.5.1

2. Create a Dockerfile that we will use to build the image for the patch

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   FROM registry.gitlab.com/gitlab-org/build/cng/gitlab-webservice-ee:v15.5.1 ARG MR_IID USER root RUN apt-get update -y && apt-get install -y patch USER git RUN curl -o /tmp/$MR_IID.patch https://code.denomas.com/denomas-com/denomas/-/merge_requests/$MR_IID.patch RUN bash -c "cd /srv/gitlab; patch -p1 < /tmp/$MR_IID.patch"

   Replace registry.gitlab.com/gitlab-org/build/cng/gitlab-webservice-ee:v15.5.1 with the image you identified in step 1.

3. Build and push the image with docker build and docker push:

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   # Replace <merge_request_id> with the ID of the merge request containing the patch. docker build --build-arg MR_IID=<merge_request_id> -t path/to/remote/registry/gitlab-webservice-ee:v15.5.1 . docker push path/to/remote/registry/gitlab-webservice-ee:v15.5.1

4. Update the deployment to use the patched image:

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   # Replace every instance of registry.gitlab.com/gitlab-org/build/cng/gitlab-webservice-ee:v15.5.1 # with the new image kubectl -n <gitlab-namespace> edit deployment <webservice-deployment>

To revert the patch, you can edit the deployment to use the original image.

Note:

• This process only applies to the Rails application (the Denomas repository). You will need to patch a different image depending on the Denomas component, you want to patch.
• This is different with Patching the Rails code in the toolbox pod. Patching rails code directly in the toolbox pod will not apply the patch to the rails code that is serving the requests to the users.
• You will need to create a new image with the patch if you upgraded the helm chart to a newer version of Denomas.

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